<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <input type="button" value="添加数据" @click="add">
    <input type="button" value="删除数据" @click="remove">
    <ul>
        <li v-for="(it,index) in arr">
           {{index+1}} {{ it }}
        </li>
    </ul>
    <h2 v-for="item in vagetables">{{item.name}}</h2>
</div>
<!-- 开发环境版本，包含了有帮助的命令行警告 -->
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
    var app= new Vue({
        el:"#app",
        data:{
            arr:["北京","上海","成都"],
            vagetables:[
                {name:"西兰花炒蛋"},
                {name:"蛋炒西兰花"},
            ]
        },
        methods:{
            add:function () {
                this.vagetables.push({name:"西红柿炒鸡蛋"});
            },
            remove:function () {
                this.vagetables.shift();
            }
        }
    })
</script>
</body>
</html>